Abstract

Abstract Bacterial polysaccharides are actively involved in the metabolism of soil microorganisms and are potentially used by them to supply 90–98 per cent of their energy requirement. Microbial transformation of bacterial polysaccharides in soil is accompanied by the formation of considerable amounts of oligoglucosides which are partially utilized by the soil biota and partially washed out from soil. Enrichment of soil with bacterial polysaccharides induces changes in the structure of microbial cenosis, activates mineralizing processes and increases the total metabolic activity of soil microflora. The growth of natural association of soil microorganisms in the utilization of bacterial polysaccharides has a higher economic coefficient than in the utilization of plant polysaccharides and sucrose. The rate of bacterial exopolysaccharide use was lower than of plant exopolysaccharides. This possibly facilitates their survival and participation in soil processes.

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